<div id="footer" class="container">
    <nav class="navbar navbar-default navbar-fixed-bottom">
        <div class="navbar-inner navbar-content-center">
            <p class="text-muted credit" style="padding: 10px; text-align: center">
                <a href="mailto:admin@codingonline.net">联系管理员</a>
            </p>
        </div>
    </nav>
</div>